“I know, Lou. But how could a light ray machine explode mines that were under water? Why, if it could be done, military warfare would be revolutionized!”
“Unbelievable changes are coming every day.”
“This one certainly is unbelievable! I’ll take no stock in it unless I see the machine work with my own eyes!”
Approaching the shack, the girls saw no one. The door was closed. And it was locked, Penny discovered, upon testing it.
“No one here,” she said in disappointment.
“They must be around somewhere,” Louise declared, unwilling to give up. “Maybe that car belongs to them.”
A sedan stood in a weed-grown lane not far away. Penny, turning to gaze carelessly at it, suddenly became excited.
“Lou, this trip has been worth while!” she cried. “Look at the license number of that auto! It’s D F 3005!”
CHAPTER
11
A FAMILIAR CAR
Louise gazed again at the automobile parked in the lane and at its mud-splattered license number.